They aren't down -- but DNS they use seems to be down at the moment. for me github, twitter, seamless and many other down. looks like it's dyndns related, as i

They aren't down -- but DNS they use seems to be down at the moment. for me github, twitter, seamless and many other down. looks like it's dyndns related, as it doesn't respond. Google's public DNS isn't responding to them, but opendns (208.67.222.222) helps here.